Models 3940 and 3949_________________________________________________________________Start-Up and Operation
4 - 1
Section 4 - Routine Maintenance
4.1 Cleaning the Incubator
De-energize all potential sources of energy to this
unit and lockout/tagout their controls. (O.S.H.A.
Regulation, Section 1910-147.)
The continued cleanliness of the stainless steel used in
Forma products has a direct effect on the appearance and opera-
tion of the unit. Use the mildest cleaning procedure that will do
the job effectively. Clean the outside of the incubator with soap
and water or with any non-abrasive commercial spray cleaner.
Clean the inside of the chamber with alcohol and/or soap and
water. Disinfect the interior panels with a general use laboratory
disinfectant, diluted according to the manufacturer’s instruc-
tions. rinse the surface thoroughly after each cleaning and wipe
the surfaces dry. always rub in the direction of the finish polish
lines.
Do not use chlorinated solvents on stainless steel
as they can cause rusting and pitting.
Do not use volatile or aromatic solvents for
cleaning inside the cabinet as their residue can
contaminate the cabinet environment.
The Thermopane glass door may be cleaned with commer-
cial glass cleaner or with a solution of ammonia and water.
Press the Mode key to scroll through the menus until the
upper and lower displays show “2 Loc” (Figure 3-11). Press the
down arrow key until the 2 becomes 0 (zero) as shown in
Figure 3-12.
Press the Display key to return to showing the setpoint and
actual temperatures. All safeguards are now removed and the
controller may be programmed. Refer to the Watlow publica-
tions included with this operating manual.
Reprogramming the temperature or humidity
controllers will change the factory default
settings and may seriously alter the performance
of the incubator and void the warranty. Contact
the Thermo Forma Service Department, at 1-888-
213-1790.
3.5 Air Exchange Ventilator Caps
Air exchange for the incubator is regulated through the
manually adjustable intake and exhaust ventilator caps located
on the top of the cabinet.
When viewed from the front of the incubator, the intake
cap is on the left and the exhaust cap is on the right. The venti-
lator caps may be opened by turning counterclockwise, and
closed by turning clockwise.
For optimum performance of the unit, the vent caps should
be closed at all times.
3.6 Heatless Dryer P/N 1900139 (optional)
The optional heatless dryer provides dehumidification for
the incubator chamber. The dehumidify switch must be turned
on for the dryer to operate. The dryer is controlled with the
humidity controller.
Figure 3-11
Figure 3-12
